MsgCommunicator: Delphi Instant Messaging (IM) SDK
for easy creation of custom messenger system
Determines if user specified by UserID is logged on.
function IsUserLogged(const UserID: Cardinal): Boolean;
Call IsUserLogged to check if the user with specified UserID identifier is registered in the users database on this server and now is logged on. IsUserLogged returns True if such user is on-line and logged on the server; otherwise returns False.